類鈹硼離子的光離共振的平行與交錯

Abstract

本研究是應用「多組態相對論性混相理論( Multiconfiguration Relativistic Random-Phase-Approximation, MCRRPA )」，來分析雙價電子的原子其雙激發共振態之光游離過程。並估算光游離過程的散射截面、光 電子角分佈與三個極化參數。 本研究所探討的光子能量範圍皆在(121/221/2)2S1/2和(121/223/2)2Po1/2兩游離閾之間，而硼離子(B+)所對應的能量為25.16 和31.15 電子伏特。在此 能量範圍裡，我們可觀測到光電子譜，所呈現的五组瑞德伯自游離共振結 構，分別為(2pns)3.1Po1、(2pnd)3.1Po1 和(2pnd)3Do1 五组瑞德伯共振結構會依照順序有規律的重複出現，研究發現事實不 然，當量子數n 逐漸變大時，瑞德伯共振結構彼此之間會有交錯、平行、 重疊的現象出現。瑞德伯共振結構彼此之間是相互交錯而過、還是相互平 行避開，針對瑞德伯共振結構位置相近的共振態，找出其性質並對應出應 當相對應的命名，這將是我們主要研究、討論的課題。

We have investigated photoionization of ground state of Be-like, Boron, ions the photon energy range 25.16 to 31.15 eV. Calculation of cross section σ for double-excitation auto ionization resonances of Be-like Boron ion using the multiconfiguration relativistic random-phase approximation ( MCRRPA ) are performed. Precise energies and widths of all five Rydberg series of doubly-excited states (2pns)3.1Po1, (2pnd)3.1Po1, and (2pnd)3Do1, are given in the photon-energy region between (1s22s)2S1/2 and (1s22p)2P1/2 ionization and experimental works and excellent agreement is also shown. Finally, we will explore the five Rydberg series is Level or Crossings in Photoionization Resonances.